Abstract
V444 Cyg is a short-period (4d) binary composed of two massive objects, a WN star and an O star. The winds of the two massive components collide, generating X-ray emission. A monitoring campaign in the high-energy domain was performed using Swift and XMM-Newton, with surprising results on the collision geometry (wide shock opening angle, clear Coriolis deflection). Polarimetric data fur- ther help to understand the system properties. This new information places strong constraints on the physical parameters of the two stars.
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